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W. H. MIDIRME.I MANUFAGTURB' 0E PICKS.

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Wikia-wei f #M @W UNITED STATE-S PATENT OEEICE.

WILLIAM HY. M. NEAVE, OF SHEFFIELD, ENGLAND.

MANul-ACTURE oF PICKS.

SPECIFICATION forming part of Letters Patent No. 502,746, dated August 8, 1893.

Application filed August 20, 1891. Serial No. 403,199. (No model.) Patented in Belgium January 15, 1891, No. 93,437, and

in Englanrldanuary 2l, 1891.110. 1,094.

To @ZZ whom it may concern:

Be it known that I, WILLIAM HENRY MARS- DEN N EAvE, a subject of the Queen of Great Britain, residing in Sheffield, in the county of York, England, have in vented certain new and useful Improvements in the Manufacture and Construction of Picks, (for which I have received Letters Patent in Great Britain, dated January 2l, 1891, No. 1,094, and in Belgium, dated January 15, 1891, No. 93,4379 and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates .to the construction of picks, and other like tools having loose or detachable points, and particularly to the process of manufacture of same, which refers to the method of preparing the socket holes, so that they will correspond with and accurately. iit upon the Shanks of the points.

The annexed sheet of drawings shows how I carry the first part of my invention into effect.

Figure 1 is a plan of a pick with one point in position, and end View; Fig. 2, an elevation of same, with part of side removed; Fig. 3, end of pick head, showing triangular hole; Fig. 4, an illustration of open side socket hole, or groove; Fig. 5, a pick with releasing slots' through side, over the shaft; Fig. 6, a one ended pick. Fig. 7 shows novel position of releasing slots.

I make the pick head A, of any suitable conguration such as that shown, having an eye, or shaft socket B, and straps O, and two short arms D, extending in opposite directions, and provided with socket holeslE', to receive and hold the points F, and having releasing slots G, for knocking out the points when required. I form the'socket holes E, which are to receive the points F, of a more or less dovetailed cross section, and also tapering from the front to the back, on two or more sides.V

The pick shown in Fig. 5 is made with one or more releasing slots of any convenient shape, two being shown. rThey are made through the side of the head over the end of the socket for the shaft, which only passes partly through the head. By this arrangement a shorter head is obtained than that shown in Fig. l.

In Fig. 6, I have shown a single end pick, for use iii-cramped situations, or otherwise; this pick is made with the socket hole passing completely through, and the shank of the point is made long enough to project as shown, so that it can be readily released by a blow at that end.

In the arrangement shown in Fig. 7, the releasing slots are made vertically and opening into the eye B, for the shaft.

The improvement in the manufacture of cast pick heads A, refers to the method of preparing the socket holes E, to insure perfect accuracy in form and finish, on which their retaining power depends. Instead of driving serrated drifts, when the castings are cold, into the socket holes already formed in the castings, or filing the holes to a gage,

neither process giving the accuracy desired,

I prepare plain mandrels or'drifts of the eX- act size and proportions of the required socket holes, and having heated the pickhead to the desired degree in a suitable hearth or furnace, I drive one of the beforementioned mandrels or drifts into each socket hole while the casting is hot, clearing out the core sand, and any metal flash, and I leave the mandrels in position until the casting is cool. While the mandrels are in position, the hot casting may with advantage be pressed, hammered, or the like, to close the metal upon mandrels, to produce a perfect iit; when the casting is cool the mandrels are driven out leaving the holes perfectly smooth and clean.

Having vnow particularly described my invention and shown various methods of carrying it' into practice, I declare that what I desire to secure by Letters Patent is-r The hereinbefore described processoffforming cast pick heads for detachable points consisting in casting the, heads with4 openings extending longitudinally of the head,reheat ing said head, driving intol the socket while the casting is hot,a mandrel of the exact size presence of two Witnesses, this 31st day of of the openingr desired; withdrawing Said July, 1891.

mandrel after the castillo is cool and iittin7 the removable points to sl-id socket, substanb- WILLIAM HY' M' NBAVE 5 tially as described. W'itnesses:

In testimony that I claim the foregoing as ROBT. F. DRURY,

my OWn I have mixed hereto my signature, in GILBERT. N. DRURY. 

